[PATCH] drm/nouveau: Make clock gate support conditional

[Thierry Reding]

From: Thierry Reding <treding at nvidia.com>

The recently introduced clock gate support breaks on Tegra chips because
no thermal support is enabled for those devices. Conditionalize the code
on the existence of thermal support to fix this.

Fixes: b138eca661cc ("drm/nouveau: Add support for basic clockgating on Kepler1")
Cc: Martin Peres <martin.peres at free.fr>
Cc: Lyude Paul <lyude at redhat.com>
Signed-off-by: Thierry Reding <treding at nvidia.com>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
index bf62303571b3..3695cde669f8 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
@@ -301,7 +301,7 @@ nvkm_therm_attr_set(struct nvkm_therm *therm,
 void
 nvkm_therm_clkgate_enable(struct nvkm_therm *therm)
 {
-	if (!therm->func->clkgate_enable || !therm->clkgating_enabled)
+	if (!therm || !therm->func->clkgate_enable || !therm->clkgating_enabled)
 		return;
 
 	nvkm_debug(&therm->subdev,
@@ -312,7 +312,7 @@ nvkm_therm_clkgate_enable(struct nvkm_therm *therm)
 void
 nvkm_therm_clkgate_fini(struct nvkm_therm *therm, bool suspend)
 {
-	if (!therm->func->clkgate_fini || !therm->clkgating_enabled)
+	if (!therm || !therm->func->clkgate_fini || !therm->clkgating_enabled)
 		return;
 
 	nvkm_debug(&therm->subdev,
@@ -395,7 +395,7 @@ void
 nvkm_therm_clkgate_init(struct nvkm_therm *therm,
 			const struct nvkm_therm_clkgate_pack *p)
 {
-	if (!therm->func->clkgate_init || !therm->clkgating_enabled)
+	if (!therm || !therm->func->clkgate_init || !therm->clkgating_enabled)
 		return;
 
 	therm->func->clkgate_init(therm, p);
-- 
2.15.1